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Discussion Starter · #1 ·
On my 300ex the previous owner cut the parking brake cable so I took that off and replaced it with a block off plate. I bled the brake line and fluid was getting through the line but the pedal was still going to the floor. My problem now, I think, is that the caliper (rear) is locked up, but could this be a collapesed brake line or master cylinder?
 

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Welcome to the forums. Try clamping the rubber brake line off where it leaves the master cylinder. Then see if the brake will pump up. If it still won't, the master cylinder is bad. You can use vise grips to clamp it off, but be careful not to damage the hose. You shouldn't have to clamp the line too tight to block it off.
 

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Agree^^^^^ you can also try gravity bleeding the system too. just remove the resovior cover and crack the bleeder loose for about 10 min and keep the resi. full all the time. If the screws won't come out just loosen the clamp un bolt it from the frame, flip it over fill it up and pour a little in the line the quickly put the tank back on the line. I have to do mine that way I haven't bought another tank yet. But it works
 

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Discussion Starter · #4 ·
i looked thru the caliper and it seems fine. the brake pads are not even trying to grab, so i think it is the master cylinder. i think it is actually a seal that is worn out thus creating pressure issues.
 

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If you want to check the caliper remove it. Remove the pads and try to press the piston into the caliper with a C clamp. If the piston does press into the caliper with relative ease your caliper is ok.
 

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Discussion Starter · #7 ·
well still waiting on the rebuild kit. as of now im almost positive the caliper is fine.
elmerkit the fluid is a normal clear looking color. hopefully the parts will be in tomorrow.
 
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